Portable greenhouse



FIG. 1 is a rear elevational view of the portable greenhouse showing mynew design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is sectional view taken vertically through the mid-plane of thedevice at line 7--7 of FIG. 5 thereof.

The ornamental design for a portable greenhouse, as shown and described.